Mozilla Firefox ESR 52.3.0 (32-bit) remains a critical version for users of legacy operating systems like Windows XP and Windows Vista. As of May 2026, this version is purely for archive and specialized compatibility purposes, as it has long passed its "End of Life" (EOL) for security updates. Key Features and Compatibility
Because this is a legacy version, you must use Mozilla's official archive servers. Avoid third-party "driver" or "freeware" sites to reduce the risk of malware. Firefox ESR 52.3.0 System Requirements mozilla firefox esr 52.3 0 32 bit download
Firefox 52.3.0 ESR was part of the "52esr" family, which served as the final bridge for several legacy technologies: Mozilla Firefox ESR 52